This ancient subterranean megalopolis is known for the hot oil traps that were installed above each of its entrances.

Venture into the hideout of one of Hong Kong's legendary pirates.

The original film set of Luke Skywalker's Tatooine home from the 'Star Wars' trilogy.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

In this historic region, homes and churches are carved into ancient volcanic rock formations.

A Spanish town built into the cliffs.

This unique exhibit "Dialogue in the Dark" reverses roles as the visionless become guides and the sighted become ‘blind.’

Hidden beneath a washing machine in a fake kibbutz, this secret bullet factory has been preserved as a museum.

Renaissance villa and gardens complete with a tormented colossus.

Filled with goldfish swimming in a shallow pool of sea water, this ancient crypt is more wishing well than burial site.

This remarkable cave was discovered after a shepherd watched bees enter and exit through a small fissure.

An ancient capital city that dates back 3,000 years old and harbors many surprises.

The world's longest outdoor escalator takes visitors to the top of China's largest dam and is also shaped like a dragon.

The tallest stationary dunes on Earth also happen to sing.

The most alien-looking place on Earth.

The world's largest bioluminescent area was undiscovered by science until 2005.

Roman ruins top white travertine terraces formed by ancient hot springs.

In paradise, feral pigs have claimed an island all to themselves.

A Turkish ghost town abandoned in a population exchange with Greece.

Once described as the "Eagle's Nest," this ruined ancient city rests on a remote mountaintop.

A 19th century artistocrat's mansion, turned into a library, hidden in a modern library.

A marvel of Byzantine engineering under the streets of Istanbul.

Japanese island famous for poison gas and fluffy bunnies.

These Nubian pyramids are strange and unique, even by pyramid standards.